Helleborus plant named ‘HLR 160’

ABSTRACT

A new and distinct cultivar of  Helleborus  plant named ‘HLR 160’, characterized by its upright plant habit; freely flowering habit; long flowering period; single white and greyed purple bi-colored flowers; and good garden performance.

Botanical designation: Helleborus orientalis.

Cultivar denomination: ‘HLR 160’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Helleborus plant, botanically known as Helleborus orientalis, and hereinafter referred to by the name ‘HLR 160’.

The new Helleborus plant is a product of a planned breeding program in Glandorf, Germany. The objective of the breeding program was to create new uniform Helleborus cultivars with unique and attractive flower coloration and resistance to pests.

The new Helleborus plant originated from a cross-pollination conducted by the Inventor in Glandorf, Germany in November, 2002 of two unnamed proprietary seedling selections of Helleborus orientalis, not patented. The new Helleborus plant was discovered and selected by the Inventor as a single flowering plant from within the progeny of the stated cross-pollination grown in a controlled greenhouse environment in Glandorf, Germany in February, 2005.

Asexual reproduction of the new Helleborus plant by divisions in a controlled greenhouse environment in Glandorf, Germany since March, 2005, has shown that the unique features of this new Helleborus plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Helleborus have not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment and cultural practices such as temperature and light intensity without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘HLR 160’. These characteristics in combination distinguish ‘HLR 160’ as a new and distinct cultivar of Helleborus:

-   -   1. Upright plant habit.     -   2. Freely flowering habit.     -   3. Long flowering period.     -   4. Single white and greyed purple bi-colored flowers.     -   5. Good garden performance.

Compared to plants of the parent selections, plants of the new Helleborus are more uniform and more freely flowering.

Plants of the new Helleborus can be compared to plants of Helleborus orientalis ‘HGC Merlin’, disclosed in U.S. Plant Pat. No. 15,705. Plants of the new Helleborus differ primarily from plants of ‘HGC Merlin’ in the following characteristics:

-   -   1. Plants of the new Helleborus have larger flowers than plants         of ‘HGC Merlin’.     -   2. Flowers of plants of the new Helleborus are white and greyed         purple in color whereas flowers of plants of ‘HGC Merlin’ are         dark purple in color.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the overall appearance of the new Helleborus plant, showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Helleborus plant.

The photograph on the first sheet comprises a side perspective view of a typical flowering plant of ‘HLR 160’ grown in a container.

The photograph on the second sheet is a close-up view of a typical flower of ‘HLR 160’.

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations, measurements and values describe plants grown in Glandorf, Germany in 1.5-liter containers during the winter in a glass-covered greenhouse and under conditions which closely approximate commercial Helleborus production. During the production of the plants, day temperatures ranged from 12° C. to 32° C. and night temperatures ranged from 3° C. to 18° C. Plants were one year old when the photographs and the description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2007 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical classification: Helleborus orientalis ‘HLR 160’. -   Parentage:     -   -   Female, or seed, parent.—Unnamed proprietary seedling             selection of Helleborus orientalis, not patented.         -   Male, or pollen, parent.—Unnamed proprietary seedling             selection of Helleborus orientalis, not patented. -   Propagation:     -   -   Type.—By tissue culture.         -   Time to initiate roots.—About two months at 12° C.         -   Time to produce a rooted young plant.—About six months at             4° C. to 15° C.         -   Root description.—Thick to thin, fleshy; white to brown in             color.         -   Rooting habit.—Sparse. -   Plant description:     -   -   Plant form and growth habit.—Herbaceous perennial; upright             plant habit; moderately vigorous growth habit.         -   Plant height.—About 33.8 cm.         -   Plant diameter (area of spread).—About 30.7 cm. -   Foliage description:     -   -   Arrangement.—Palmately compound with five leaflets per leaf.         -   Leaf length.—About 10.8 cm.         -   Leaf width.—About 13.7 cm.         -   Leaflet length.—About 7.4 cm.         -   Leaflet width.—About 3 cm.         -   Leaf shape.—Palmate; orbicular in outline.         -   Leaflet shape.—Obovate; lowest leaflets cleft to             three-parted.         -   Leaflet apex.—Acute.         -   Leaflet base.—Attenuate.         -   Leaflet margin.—Sharply senate.         -   Leaflet texture, upper and lower surfaces.—Smooth, glabrous;             leathery.         -   Leaflet venation pattern.—Pinnate.         -   Leaflet color.—Developing leaves, upper surface: Close to             143A. Developing leaves, lower surface: Close to 144A. Fully             developed leaves, upper surface: Close to N137B; towards the             base, close to 177A; venation, close to 144C. Fully             developed leaves, lower surface: Close to 146A to 146B;             venation, close to 144C.         -   Petiole.—Length: About 10.5 cm. Diameter: About 4.5 mm.             Texture, upper and lower surfaces: Smooth, glabrous. Color,             upper and lower surfaces: Close to 144B; towards the base,             tinged with close to 186C. -   Flower description:     -   -   Flower shape and habit.—Single rotate flowers; freely             flowering habit, about 14 flowers developing per plant;             petals not observed.         -   Fragrance.—None detected.         -   Natural flowering season.—Long flowering period; plants             flower from January to March in Germany.         -   Flower longevity on the plant.—About twelve days; flowers             not persistent.         -   Flower buds.—Length: About 1.4 cm. Diameter: About 9 mm.             Shape: Ovate. Color: Close to 145D; towards the base, close             to 144C.         -   Flowers.—Diameter: About 5.4 cm. Depth (height): About 2 cm.         -   Sepals.—Arrangement: About five in a single whorl. Length:             About 3.5 cm. Width: About 3 cm. Shape: Broadly ovate. Apex:             Broadly acute. Margin: Entire. Texture, upper and lower             surfaces: Smooth, glabrous; waxy. Color: When opening, upper             surface: Towards the margins, NN155C to NN155D; central             speckled blotch, close to 187D; at the base, close to 145C.             When opening, lower surface: Close to NN155B to NN155C; at             the base, close to 145C. Fully opened, upper surface:             Towards the margins, NN155B; central speckled blotch, close             to 187D; at the base, close to 145C to 145D. With             development, close to 145C towards the margins. Fully             opened, lower surface: Close to NN155B to NN155C; at the             base, close to 145C.         -   Primary peduncles.—Strength: Moderately strong. Length:             About 29.2 cm. Diameter: About 7 mm. Aspect: Mostly upright,             about 10° from vertical. Texture: Smooth, glabrous. Color:             Close to 145B to 145C.         -   Reproductive organs.—Stamens: Quantity per flower: About 60.             Filament length: About 1.2 cm. Filament color: Close to             157D. Anther shape: Reniform. Anther length: About 2.5 mm.             Anther color: Close to 155A. Pollen amount: Moderate. Pollen             color: Close to 150D. Pistils: Quantity per flower: About             ten. Pistil length: About 1.2 cm. Stigma shape: Club-shaped.             Stigma color: Close to 157C to 157D. Style length: About             1.2 cm. Style color: Close to 144C to 144D. Ovary color:             Close to 145A. Nectaries: Quantity per flower: About 15.             Length: About 8 mm. Diameter, apex: Close to 4 mm. Diameter,             base: Close to 1 mm. Color: Close to 144B; towards the apex,             close to N144A; towards the base, close to 153A.         -   Seeds/fruits.—Seed and fruit development have not been             observed. -   Garden performance: Plants of the new Helleborus have been observed     to have good garden performance and to tolerate rain and wind.     Plants of the new Helleborus have been observed to tolerate high     temperatures of about 35° C. and are hardy to USDA Hardiness Zone 5. -   Pathogen/pest resistance: Plants of the new Helleborus have not been     shown to be resistant to pathogens and pests common to Helleborus. 

1. A new and distinct Helleborus plant named ‘HLR 160’ as illustrated and described. 